Query works on mysql 4.1.16 but return error on 4.0.22

Hy, i have this query witch works great on mysql 4.1.16, but on mysql
4.0.22 it returns error:

ERROR 1064: You have an error in your SQL syntax.  Check the manual
that corresponds to your MySQL server version for the right syntax to
use near 'SELECT COUNT( DISTINCT (
username
) ) AS no_of_users, campaign


here is the query:



SELECT main_campaigns. * , main_status.value, acl.no_of_users, rec.no_of_records
FROM main_campaigns
LEFT JOIN main_status ON main_campaigns.status = main_status.id
LEFT JOIN (

SELECT COUNT( DISTINCT (
username
) ) AS no_of_users, campaign
FROM map_acl
GROUP BY campaign
) AS acl ON main_campaigns.id = acl.campaign
LEFT JOIN (

SELECT COUNT( DISTINCT (
recordno
) ) AS no_of_records, campaign
FROM `records`
GROUP BY campaign
) AS rec ON main_campaigns.id = rec.campaign
LIMIT 0 , 30

please help me

--
===================================
Florin C.

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